(614d) Nitrogen Doped Magnetic Carbon Nanocomposits Synthesized from Melamine with Enhanced Cr(VI) Removal

With the growth in various industries, such as metal cleaning, electroplating, pigment, mining and leather processing, heavy metals (Cr, Cd, Hg, Pd and As) have become a widespread pollutant in the surface water and groundwater. Cr(VI), a typical heavy metal ions, is a commonly identified contaminant because of its high toxicity and mobility. Recently, magnetic carbon nanocomposites with large specific surface area were introduced to remove the heavy metal in the wastewater and displayed the excellent efficiency. In this work, we successfully synthesized the novel nitrogen doped carbon composites with higher magnetism and specific surface areas using melamine as carbon and nitrogen source through a simple pyrolysis method. After that, we utilized the as-synthesized materials to treat the Cr(VI) solution, and found that the excellent performance were observed (removal capacity: 29.46 mg/g, pH at 7; 2001 mg/g, pH at 1), which can be attributed to the nitrogen dopant and the iron nanoparticles on the surface. The nitrogen dopant on the carbon surface can increase its negative charge density and then enhance the ability for the adsorption of Cr(VI) ions. These results demonstrated that nitrogen doped magnetic carbon nanocomposites are the promising materials for the environmental remediation.